- Chat list: auth-gated, shows all conversations for current user
with other participant's avatar/name, last message preview,
and relative time in Macedonian (пред X мин/ч/д)
- Chat conversation: FlatList with inverted scroll, message bubbles
aligned left (other) and right (self), colored backgrounds,
timestamps, KeyboardAvoidingView send bar
- Chat mutations: getOrCreate finds or creates a 1:1 chat,
send creates message and updates lastMessageAt
- Message queries: listByChat with participant auth check
- Wired ad detail 'Започни разговор' button to create/open chat
- ChatListItem component with avatar, preview, time, link to detail
All UI text in Macedonian. TypeScript clean, Convex functions deployed.
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